} THE CITY OF NASHUA “The Cate City"
Financial Services
Purchasing Department
November 9, 2017
Memo #18-058
TO: MAYOR DONCHESS
FINANCE COMMITTEE
SUBJECT: DIGESTER CLEANING PROJECT — CO-1 (VALUE: $48,400)
DEPARTMENT: 169 WASTEWATER; FUND: WASTEWATER
Please see the attached communication from Noelle Osborne, Plant Operations Supervisor Wastewater
Department dated October 26, 2017 for the information related to this purchase.
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WOODARD
CURRAN
woodardcurran.com
COMMITMENT & INTEGRITY DRIVE RESULTS
Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
3.04 FIELD QUALITY CONTROL
A. Provide in accordance with Division 01 General Requirements.
3.05 STARTUP & COMMISSIONING
A. Provide all labor, tools, materials, personnel, and equipment necessary to assist in
the startup and testing of the SCADA system with the Integrator after installation
of control panels and instruments, and termination of field wiring to panels is
complete. Start up and testing shall be witnessed by the Owner and/or Engineer.
Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
L. Nameplates
1. All panels and panel devices shall be supplied with suitable nameplates
that identify the panel and individual devices as required. Each device
nameplate shall include up to 3 lines, with the first line containing the
device tag number as shown on the Drawings, the second line containing a
functional description, and the third line containing a functional control
description.
Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
I. Seal Fail and Motor Temperature Relays
1. Pumps, or mixers, equipped with proprietary seal fail and motor
temperature relays, shall require these relays to be mounted in the SCADA
control panel unless otherwise noted in the Drawings. The seal fail and
motor over temperature alarm contacts shall be connected to the PLC as
discrete inputs.
J. Intrinsic Safety Barrier Panels
Project Number: 228730
Issue Date: August 2017
WWTE SCADA Upgrades
Nashua, NH
suppression in strict accordance with manufacturer’s
recommendations.
3. Analog signal surge suppression
a.
Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
e. DC Wiring — Blue
f. Intrinsically Safe Wiring - Light Blue
g. Foreign Voltage — Yellow
C. Control Panel Loss of Power
1. Each control panel containing a PLC shall have an input configured to
alarm the operators upon loss of main control panel power. This alarm
shall be displayed on the SCADA nodes to alert the operators that
attention is required.
Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
AC control, DC signal. Terminal blocks shall be the compression screw
type. Spring-clamp style terminals will not be accepted.
a. Discrete inputs and outputs (DI and DO) shall have 2 terminals per
point with adjacent terminal assignments. All active and spare
points shall be wired to terminal blocks.
Project Number: 228730 WWTE SCADA Upgrades
Issue Date: August 2017 Nashua, NH
condensing. The field mounted equipment and system components shall
be designed for installation in dusty, humid, and slightly corrosive service
conditions.
3. Equipment installed in a hazardous area shall meet Class, Group, and
Division to comply with the NFPA 70 and CCR, Title 8, Electrical and
General Safety Orders.
